A Fabregat
Universitat Rovira i Virgili, Chemical Engineering, Faculty Member
Research Interests:
Uniform flexible carbon nitride coatings have been synthesized by means of annealing of films, fabricated from soluble triazine-based polymeric precursors. The coatings exhibit fascinating electrochemical stability and drastically... more
Uniform flexible carbon nitride coatings have been synthesized by means of annealing of films, fabricated from soluble triazine-based polymeric precursors. The coatings exhibit fascinating electrochemical stability and drastically increase the capacitance of coated carbon cloth electrodes. Following the analogue with turbostratic carbons, typically produced by means of polymeric precursors pyrolysis, we demonstrate that annealing of dried nitrogen-rich polymeric films results in coatings, composed by nearly equal atomic quantities of carbon and nitrogen, according to elemental analysis, and exhibiting noticeable mechanical robustness. X-ray difffraction patterns and infrared spectra of the materials allow to characterize them as partially amorphous carbon nitride with presumably heptazinic structure. Annealed films exhibit extrinsic semiconducting behavior with optical bandgaps in the range from 1.71 to 1.99 eV and fairly good conductivity. The outstanding long-term electrochemical ...
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Research Interests: Engineering, Chemistry, Catalysis, Activated Carbon, Heterogeneous Catalysis, and 12 moreBiodegradation, Respirometry, CHEMICAL SCIENCES, Hydrogen Peroxide, Phenolic compound, Oxidation, Biodegradability, Effluent, Chemical Oxygen Demand, Wet Oxidation, Aqueous Solution, and Catalytic Wet air oxidation
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Research Interests:
Research Interests:
Research Interests:
ABSTRACT The main objective of the work is to prepare catalysts based on nanoscale zero-valent iron supported on activated carbon (nZVI/AC) and to test their activity for catalytic wet peroxide oxidation of phenol. The catalysts were... more
ABSTRACT The main objective of the work is to prepare catalysts based on nanoscale zero-valent iron supported on activated carbon (nZVI/AC) and to test their activity for catalytic wet peroxide oxidation of phenol. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ICP, and N2 adsorption–desorption, and their performance was evaluated in terms of phenol and TOC removal. The effect of the initial phenol concentration and initial pH on the oxidation process was investigated. Possible leaching of iron from the catalyst into the aqueous solution was also examined. The experimental results indicate that the catalytic activity toward phenol degradation was found to be enhanced by nZVI/AC catalysts compared to that of Fe/AC. In the range 150–1,000 mg/L, phenol conversion above 90% can be reached using these catalysts after only 15 min of the reaction, and using the stoichiometric hydrogen peroxide for complete mineralization. The leaching observed is less than 4% of the total initial iron in the catalyst even after 120 min of the reaction. It was also observed that the stability or reutilization of the catalyst was fairly good.
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Research Interests:
Research Interests: Engineering, Algorithms, Materials Science, Thermodynamics, Catalysis, and 14 moreKinetics, Carbon, Medicine, Adsorption, Porosity, Color, Hazardous Materials, Nitrogen, Thermogravimetry, Carbonization, X ray diffraction, Fourier transform infrared spectroscopy, Sewage, and Medicine and Health Sciences
During the last decade, several physico-chemical and biological techniques have been developed to remove colour from textile wastewaters. Some of these techniques rely on and many will profit from activated carbon (AC). The role of AC is... more
During the last decade, several physico-chemical and biological techniques have been developed to remove colour from textile wastewaters. Some of these techniques rely on and many will profit from activated carbon (AC). The role of AC is versatile: (1) it acts as a dye adsorbent, not only in straightforward adsorption processes but also in AC-enhanced coagulation and membrane filtration processes; (2) it generates strong oxidising agents (mostly, hydroxyl (OH) radicals) in electrochemical dye oxidation; (3) it catalyses OH production in advanced oxidation processes; (4) it catalyses anaerobic (azo) dye reduction and supports biofilm growth in microbial dye removal. This paper reviews the role of AC in dye decolourisation, evaluates the feasibility of each AC-amended decolourisation technique and discusses perspectives on future research.
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Research Interests: Chemistry, Catalysis, Kinetics, Multidisciplinary, Activated Carbon, and 14 morePower Law, First-Order Logic, Phenol, Oxygen, First Order Logic, Chemical Industry, Operant Conditioning, Adsorption Isotherm Models, Lumping Kinetic Model, Carbon Fibers, Experimental Data, Catalytic Wet air oxidation, Adsorption isotherm, and Kinetic model
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... Miller, WM, and M-A Petrich, "A Novel Freshman Class to Introduce ChE Concepts and Opportunities," Ckem. Eng. Ed., 25, 134(1991) 12. Cohen, Y., W, Tsai, and S. Chetty, "A Course on Multimedia Environmental... more
... Miller, WM, and M-A Petrich, "A Novel Freshman Class to Introduce ChE Concepts and Opportunities," Ckem. Eng. Ed., 25, 134(1991) 12. Cohen, Y., W, Tsai, and S. Chetty, "A Course on Multimedia Environmental Transport, Exposure, and Risk Assessment," Chem. Eng. ...
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Research Interests:
Research Interests: Chemistry, Water Purification, Activated Sludge, Multidisciplinary, Activated Carbon, and 15 moreWastewater, Biological Wastewater Treatment, Temperature, Iron, Phenol, Hydrogen Peroxide, Phenols, Water Science and Technology, Total Organic Carbon, Biological treatment, Chemical Oxygen Demand, Oxygen Consumption, Advanced Oxidation Process, Oxygen uptake rate, and Catalytic Wet air oxidation
... using CFD Laura Pramparo,a Jeremy Pruvost,b Frank St ber,a Josep Font,a Agusti Fortuny,c Azael Fabregat,a Patrick Legentilhomme,b ... Moreover, Belleville and Legrand [5] have showed that torus reactors are characterised by an... more
... using CFD Laura Pramparo,a Jeremy Pruvost,b Frank St ber,a Josep Font,a Agusti Fortuny,c Azael Fabregat,a Patrick Legentilhomme,b ... Moreover, Belleville and Legrand [5] have showed that torus reactors are characterised by an efficient radial mixing and the absence of dead ...
Research Interests:
The catalytic potential of sludge based materials produced by steam or CO2 activation from non-treated dewatered raw sludge or dewatered mesophilic anaerobically digested sludge were tested in the oxidation of phenol. Batch and continuous... more
The catalytic potential of sludge based materials produced by steam or CO2 activation from non-treated dewatered raw sludge or dewatered mesophilic anaerobically digested sludge were tested in the oxidation of phenol. Batch and continuous experiments were conducted to assess activity and stability of these novel carbons in terms of phenol conversion, carbon burn-off and metal leaching. Overall, their catalytic activity can be considered satisfactory when compared to commercial carbons. However, further research on the preparation, activation and hardening of these sludge based materials is required to improve their thermal and mechanical stability and resistance to metal leaching during the catalytic wet air oxidation of phenol.
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Research Interests:
... Also I would like to mention those people that still ask me when are you going to be around? : Bassilis, Stelios, Xristos, Giorgos, Argiris and also Demitris and Giannis. Evidently, my brothers and my parents are also asking the... more
... Also I would like to mention those people that still ask me when are you going to be around? : Bassilis, Stelios, Xristos, Giorgos, Argiris and also Demitris and Giannis. Evidently, my brothers and my parents are also asking the same question. ...
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Research Interests: Mechanical Engineering, Chemical Engineering, Chemistry, Heat Transfer, Heat transfer coefficient, and 13 moreDynamic Modeling, Steady state, Operant Conditioning, Chemical Engineering Science, Dynamic Model of WSN, Flow Rate, Trickle Bed, Experimental Data, Water Vapor, Packed Bed, Ingeniería química, Catalytic Wet air oxidation, and dynamic model
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Research Interests:
Research Interests: Environmental Engineering, Chemical Engineering, Chemistry, Catalysis, Physical Activity, and 15 moreWastewater Treatment, Surface Chemistry, Activated Carbon, Free Radical, Anaerobic Digestion, Sewage sludge, Phenol, Active site, Surface Area, Functional Group, Batch Reactor, Elsevier, Catalytic Activity, Catalytic Wet air oxidation, and Elemental composition
Research Interests:
ABSTRACT The decolorization of azo dye Acid Orange 7 (AO7) was studied in a sequential anaerobic/aerobic reactor system; the anaerobic stage was carried out in a continuous upflow stirred packed-bed reactor (USPBR) filled with biological... more
ABSTRACT The decolorization of azo dye Acid Orange 7 (AO7) was studied in a sequential anaerobic/aerobic reactor system; the anaerobic stage was carried out in a continuous upflow stirred packed-bed reactor (USPBR) filled with biological sludge carbonaceous material (BSCM) and aerobic stage took place in an aerobic membrane bioreactor (aerobic MBR). In a continuous USPBR-BSCM system, azo dye bioconversion rates were about 99% at very short space times (τ) 1.02–1.6 min. In the sequential aerobic stage, hydraulic retention times (HRTs) were determined on removal efficiencies of chemical oxygen demand (COD), resulting about 66% at 48 h. Total organic carbon (TOC) assay showed a removal efficiency about 54.37%, suggesting the degradation of the aromatic amines produced in the anaerobic reactor. Total aromatic amine (TAA) values were 45.30 and 8.97 mg L−1 in USPBR and aerobic MBR respectively, resulting in about 80.28% removal efficiency. These results indicate that anaerobic sequential USPBR/aerobic MBR reactor system seems to be an effective and promising system for complete azo dye biodegradation.
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The aim of this study was to investigate the effect of a chelated zero valent iron as catalyst on the oxidation of six organic acids that are generally found in olive mill wastewater. The reaction was carried out in a stirred tank reactor... more
The aim of this study was to investigate the effect of a chelated zero valent iron as catalyst on the oxidation of six organic acids that are generally found in olive mill wastewater. The reaction was carried out in a stirred tank reactor under extremely mild conditions, a temperature of 30°C and atmospheric pressure. Solutions of 350 mg/L of the six organic compounds were treated individually using zero valent iron particles (15 g), nitrilotriacetic acid disodium salt (NTA, 100mg/L) and air. The efficiency of the process was evaluated to determine the organic compound conversion, the chemical oxygen demand (COD) reduction and the total organic carbon (TOC) reduction. The caffeic, 4-hydroxyphenylacetic and vanillic acids showed a total conversion after 180, 240 and 300 min of reaction, respectively. In turn, coumaric acid, tyrosol and cinnamic acid only reached conversions of 90, 87 and 68%, respectively, after 360 min of reaction. Four mixtures of the six acids with an initial total concentration of 1000 mg/L were also tested and gave an overall conversion of the organic compounds of 92-99% after 360 min of reaction. The COD conversions of the mixtures were always above 84%, but the TOC conversions values were lower, indicating a poorer mineralization.
Research Interests:
... Gergo Mezohegyi, Azael Fabregat*, Josep Font, Christophe Bengoa and Frank Stuber. Departament d'Enginyeria Qu mica, ETSEQ, Universitat Rovira i Virgili, Av. Pa sos Catalans 26, 43007 Tarragona, Catalunya,... more
... Gergo Mezohegyi, Azael Fabregat*, Josep Font, Christophe Bengoa and Frank Stuber. Departament d'Enginyeria Qu mica, ETSEQ, Universitat Rovira i Virgili, Av. Pa sos Catalans 26, 43007 Tarragona, Catalunya, Spain. Agust ...